CN111923625B

CN111923625B - PVC color film printing process

Info

Publication number: CN111923625B
Application number: CN202010779680.7A
Authority: CN
Inventors: 林启宗
Original assignee: Jiangsu Dali Building Materials Co ltd
Current assignee: Jiangsu Dali Building Materials Co ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2022-05-10
Anticipated expiration: 2040-08-05
Also published as: CN111923625A

Abstract

The invention discloses a PVC color film printing process, which comprises the steps of digitally converting an obtained original printing image to obtain a corresponding digital image; then extracting a plurality of corresponding image frameworks from the digital image according to the floating depth of the image in the original printing image, and numbering the image frameworks respectively according to the descending order of the floating depth; secondly, etching a plurality of corresponding photoetching plates by utilizing a photoetching process according to a plurality of image frameworks, etching corresponding numbers at the appointed positions of the photoetching plates, then applying corresponding pressure on the photoetching plates according to the numbers to ensure that the corresponding images are engraved on the PVC printing film by the photoetching plates, coloring the PVC printing film in a plurality of layers from deep to light according to color composition, and drying at corresponding temperature after each coloring is finished, thereby effectively ensuring the quality of finished products.

Description

PVC color film printing process

Technical Field

The invention relates to the technical field of printing, in particular to a PVC color film printing process.

Background

In the current PVC color film printing process, it is common to use a gravure printing machine to print patterns for one time, and then perform coloring and drying, but the quality of the final product cannot be guaranteed.

Disclosure of Invention

The invention aims to provide a PVC color film printing process which can effectively ensure the quality of finished products.

In order to achieve the purpose, the invention provides a PVC color film printing process, which comprises the following steps:

obtaining an original printing graph and converting the original printing graph to obtain a digital image;

dividing and numbering the digital images according to the printing requirements;

printing, multi-level coloring and drying are carried out according to the arranged serial numbers.

Wherein, obtain original printing figure and carry out the conversion, obtain the digital image, include:

and acquiring an original printing image file, performing digital conversion, and filtering and denoising the converted image to obtain a digital image.

Wherein, according to the printing requirements, segmenting and numbering the digital images comprises:

and extracting a plurality of corresponding image frameworks from the digital image according to the floating depth of the image in the original printing image, and numbering the image frameworks respectively according to the descending order of the floating depth.

Wherein, according to the printing requirement, the digital image is divided and numbered, and the method further comprises the following steps:

and etching a plurality of corresponding photoetching plates by utilizing a photoetching process according to the extracted image frameworks, and etching the corresponding numbers at the designated positions of the photoetching plates.

Wherein, print and multilayer colouring and stoving according to the serial number of arranging, include:

and acquiring a PVC printing film to be printed, sequentially utilizing a plurality of photoetching plates on the faceted surface of the PVC printing film according to the serial number on the photoetching plate, and applying equivalent pressure to the photoetching plates according to the corresponding depth of the relief.

Wherein, print and multilayer colouring and stoving according to the serial number of arranging still includes:

and after the photoetching plate is used for carrying out convex engraving on the PVC printing film, according to the color composition of the original printing image, the PVC printing film is colored in a multilayer manner from deep to light, and is dried after each coloring is finished.

Wherein the printing process further comprises:

setting the drying temperature within 60-50 ℃ according to the number corresponding to the photoetching plate, sequentially cooling and drying according to the arithmetic progression with the tolerance of 2 ℃, and setting the corresponding drying temperature after coloring to be 60 ℃.

According to the PVC color film printing process, the obtained original printing image is subjected to digital conversion to obtain a corresponding digital image; then extracting a plurality of corresponding image frameworks from the digital image according to the floating depth of the image in the original printing image, and numbering the image frameworks respectively according to the descending order of the floating depth; secondly, etching a plurality of corresponding photoetching plates by utilizing a photoetching process according to a plurality of image frameworks, etching corresponding numbers at the appointed positions of the photoetching plates, then applying corresponding pressure on the photoetching plates according to the numbers to ensure that the corresponding images are engraved on the PVC printing film by the photoetching plates, coloring the PVC printing film in a plurality of layers from deep to light according to color composition, and drying at corresponding temperature after each coloring is finished, thereby effectively ensuring the quality of finished products.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic step diagram of a PVC color film printing process provided by the present invention.

Fig. 2 is a schematic diagram of a supplementary step of the PVC color film printing process provided by the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1, the present invention provides a PVC color film printing process, including:

and S101, acquiring an original printing graph and converting to obtain a digital image.

Specifically, the manufacturing process of the PVC printing film to be printed is mature, the PVC printing film to be printed can be directly obtained by the existing process, for example, PVC resin, titanium dioxide and dioctyl ester are added into a stirring container, the mixture is heated to 110-130 ℃, uniformly stirred, then heated to 170-190 ℃ in an internal mixer for preliminary plasticization, heated to 170-190 ℃ in a two-roll mill for continuous plasticization, heated to 120-140 ℃ in an extruder for further uniform plasticization, filtered by impurities, heated to 140-160 ℃ in a four-roll calender for calendering to form the PVC printing film, and then cooled and rolled into a standby product by five rolls, wherein the weight parts of the PVC resin, the titanium dioxide and the dioctyl ester are 100: 2: 25. The printing ink used in the printing process can be 34-36% of waterborne polyurethane resin, 21-23% of thinner, 14-16% of pigment, 3.5% of heat stabilizer and the balance of water. Wherein the thinner, the pigment and the heat stabilizer can be set automatically according to the actual production requirement.

Because the original printing image provided by the customer may be a stereo image, and the imprinting template is not convenient to obtain according to the original image, the original printing image is digitally converted, and the converted digital image is filtered and denoised by using a common filtering and denoising method, so that the image precision of the obtained digital image can be improved, the precision of the imprinting template obtained by the digital image in the back can be ensured, and the quality of a finished product can be improved.

And S102, segmenting and numbering the digital image according to the printing requirement.

Specifically, because in the printing process, the original printing pattern is a three-dimensional image with different relief heights, the conventional engraving process utilizes a whole engraving plate to perform engraving on the PVC printing film by one-time pressure application, but in the pressure application process, it cannot be guaranteed that each size can be just clamped on the corresponding precision or error range, and the whole engraving plate can be worn at different sizes and different places, so that the precision of the obtained engraving image is not high, the cost for manufacturing the whole engraving plate is high, and the manufacturing cost is increased. Therefore, during imprinting, a plurality of image frameworks are correspondingly extracted from the digital image according to different relief depths, wherein the image frameworks all have the same outer-dimension frame, so that image calibration is facilitated during image imprinting, and the image frameworks are numbered according to the relief depths in a descending order, namely deep and shallow according to the imprinting depths corresponding to the different image frameworks.

Because a plurality of image frameworks are extracted, a plurality of corresponding images can be etched on a plurality of photoetching plates by utilizing the photoetching principle, and corresponding numbers are etched on the photoetching plates at places which do not influence printing and are obvious, such as the upper left corner or the upper right corner of the photoetching plate, which is far away from the image frameworks. The number is convenient to observe when the photoetching plate is used for engraving, and the corresponding image framework can be cut by using technologies such as linear cutting and the like besides etching the photoetching plate by using the photoetching principle for engraving. And no matter use photoetching or line cutting, the cost is lower to obtain corresponding template according to the different degree of depth, even appear wearing and tearing, also only need to change corresponding template, and do not need the monoblock to change, reduced manufacturing cost, also improved the seal precision.

And S103, printing, coloring at multiple levels and drying according to the arranged serial numbers.

Specifically, according to the number of the engraving on the photoetching plate, the corresponding photoetching plate is sequentially used according to the number to engrave on the corresponding position of the faceted surface of the PVC printing film to be printed, when the engraving is performed, the equivalent pressure is required to be applied according to the corresponding size depth of the original printing image, so that the engraving depth is consistent with the original printing image, then the engraving is performed deeply and shallowly, and the equivalent pressure is sequentially applied according to the number to engrave on the PVC printing film. And because the pressing is used, the corresponding image structure on the photoetching plate can be protruded on the faceted surface, and a plurality of photoetching plates have deep and shallow imprints, so that higher-precision imprinted images can be obtained.

After the photoetching plate is used for carrying out convex engraving on the PVC printing film, the obtained printing image which is higher in matching degree with the original printing image is formed, then the PVC printing film is colored in a multi-layer manner from deep to light according to the color of the original printing image, and drying is carried out after each coloring is finished; the method comprises the steps of firstly coloring and drying an engraved image by a dark color, then coloring the engraved image by a light color, wherein the light color pigment cannot change too much to the previous color or has no influence on a substrate, so that the influence on the finished quality of a finished product is not large, if the light color is firstly colored, then the dark color is colored, and if the previous light color is not completely dried or dried, the immersion and the covering of the dark color pigment can change the previous coloring quality, and finally the finished quality of the finished product can be changed.

Meanwhile, during drying, according to the number corresponding to the photoetching plate, the drying temperature is set to be within 60-50 ℃, the temperature is sequentially reduced and the drying is carried out according to the arithmetic progression with the tolerance of 2 ℃, the corresponding drying temperature after the coloring is finished is set to be 60 ℃, and during the first drying, the drying is carried out at the high temperature of 60 ℃, because the chroma of the coloring pigment is deep during the first coloring and the pigment is far away from a drying machine, the temperature setting is high, the drying time can be properly increased, and the complete drying of the pigment is ensured. With the shortening of the distance and the reduction of the color chromaticity, the drying temperature and the drying time can be gradually reduced, for example, the first time is 60 ℃, the second time is 58 ℃, the third layer is 56 ℃, but the minimum temperature can only be 50 ℃, but after the last coloring is finished, the drying temperature is set to be 60 ℃, the last coloring can be dried, the whole PVC printing film can be completely dried, the obtained finished product is in a completely dried state, the printing of the PVC printing film is finished, and the PVC color film with higher quality of the finished product is obtained.

Referring to fig. 2, the printing process further includes:

and S104, glazing and film coating the dried PVC color film.

Specifically, after drying is completed, a PVC color film with high finished product quality is obtained, then UV glazing, oil passing, stamping, and the like are performed on the PVC color film, then film covering operation is performed, glazing and the like are performed firstly, and then film covering is performed, so that the brightness of the color of the PVC color film can be improved, and the protection degree of the PVC color film can be prolonged and the service time of the PVC color film can be prolonged.

And S105, cutting the finished product after film coating according to the original printing image.

Specifically, the coated PVC color film is cut according to the boundary size in the original printed image, in the cutting process, the numbers on the photoetching plate can be cut together to obtain a complete PVC color film with a compliant size, and the operations of glazing, coating and cutting are adopted to ensure that each corner of the PVC color film is glazed and coated, and in the cutting process, the pressure generated by cutting can increase the degree of adhesion between the coated film and the PVC color film, thereby further increasing the finished product quality of the OVC color film. And then packaging and packing the cut PVC color film or combining the PVC color film with other sun-proof films or mosquito-proof textiles to form a composite product with various effects.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A PVC color film printing process is characterized by comprising the following steps:

printing, coloring and drying in multiple layers according to the arranged serial numbers;

obtaining an original printing image and converting the original printing image to obtain a digital image, wherein the digital image comprises:

acquiring an original printing graph, performing digital conversion, and filtering and denoising the converted image to obtain a digital image;

segmenting and numbering said digital images according to printing requirements, comprising:

extracting a plurality of corresponding image frameworks from the digital image according to the floating depth of the image in the original printing graph, and numbering the image frameworks respectively according to the descending order of the floating depth; etching a plurality of corresponding photoetching plates by utilizing a photoetching process according to the extracted image frameworks, etching the corresponding numbers at the set positions of the photoetching plates, and applying corresponding pressure on the photoetching plates to ensure that the corresponding images are engraved on the PVC printing film by the photoetching plates.

2. The PVC color film printing process of claim 1, wherein the digital image is segmented and numbered according to printing requirements, further comprising:

3. The PVC color film printing process of claim 2 wherein printing and multi-level coloring and drying according to the ordered sequence number comprises:

4. The PVC color film printing process of claim 3, wherein printing and multi-level coloring and drying are performed according to the arranged serial number, further comprising:

5. The PVC color film printing process of claim 4, further comprising: